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Non-Operating Income and Deductions, Net (Tables)
 3 Months Ended
Mar. 31, 2013
Non-Operating Deductions, Net [Abstract]  
Non-operating Income and Deductions
 
Three Months Ended
(millions of dollars)
 
 
March 31, 2013
 
 
 
April 1, 2012
 
   
Interest income  
$
0.7
 
 
$
1.0
 
 
Interest expense  
 
(0.8
)
 
 
(0.8
)
 
Foreign exchange gains (losses)  
 
0.6
 
 
 
(0.4
)
 
Other deductions  
 
(0.3
)
 
 
(0.4
)
Non-operating income (deductions), net  
$
0.2
 
 
$
(0.6
)